Are there changing rooms?

Yes

Yes, near the wave pools there are changing rooms, restrooms, showers and lockers all housed together. The showers water is heated and there is ample room to accommodate changing clothes.

Yes the rooms are near the lockers for convenience, and if you need to use the restroom it's connected.

They have big changing rooms with showers and bathrooms inside. They're located near the front of the park close to the wave pool.